Twelve-by-six-millimeter spiny oyster shell with blue composite turquoise and enamel sterling silver dangle earrings - the Southwest earring that combines three distinct material expressions in a single piece. The spiny oyster shell provides vivid organic color; the composite turquoise provides the Southwest heritage blue-green; the enamel adds a controlled color element that bridges the two natural materials. Composite turquoise. Natural spiny oyster.